<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <title>Code</title>
    <style>
        body {
            margin: 0;
            overflow: hidden;
        }
    </style>
</head>

<body>
    <h1>
        <center>404 Not Found</center>
    </h1>

    <canvas id="myCanvas"></canvas>
    <script>
        const width = document.getElementById("myCanvas").width = screen.availWidth;
        const height = document.getElementById("myCanvas").height = screen.availHeight;
        const ctx = document.getElementById("myCanvas").getContext("2d");
        const arr = Array(Math.ceil(width)).fill(1);
        const str = "4  0  4".split(" ");

        function rain() {
            ctx.fillStyle = "rgba(0,0,0,0.05)";
            ctx.fillRect(0, 0, width, height);
            ctx.fillStyle = "#0f0";
            arr.forEach(function (value, index) {
                ctx.fillText(str, index * 10, value + 10);
                arr[index] = value >= height || value > 8888 * Math.random() ? 0 : value + 10;
            });
        }

        setInterval(rain, 100);
    </script>
</body>

</html>